Exposure accuracy is hit-and-miss for subject with bright areas, but this is also true of most DSLRs, even those with “matrix” metering. Which is why I almost always shoot with manual exposure, using the histogram as needed.
Exposure accuracy with the X100 is very good— meaning that the camera will blow-out highlights that might be key to the shot, yet the overall shot will be properly exposed (on average). Yet the X100 sensor seems to have excellent dynamic range, so exposure is not a problem so long as one shoots RAW and avoids JPEG.
Shoot RAW, even if the desired result is JPEG
Even if you want only JPEG as the end result, you are much better off shooting RAW, then batch-processing the RAW to JPEG, then tossing the RAW.
By shooting RAW, you can choose exposure, white balance and sharpening later, and you stand a far better chance of rescuing too-dark or too-light images. See the RAW-vs-JPEG page for an example of sharpening differences.
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